switchback

noun

🔊/ˈswɪtʃbæk/

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a road or railway track that has many sharp bends as it goes up a steep hill, or one that rises and falls steeply many times（公路或铁路坡道上的）之字形路线；（公路或铁路的）不断起伏的路线Topics Transport by car or lorryc2, Transport by bus and trainc2
(North American English) a 180 degree bend in a road that is going up a steep hill（陡坡路上的）急转弯，180 度的转弯 synonym hairpin bend
(British English, old-fashioned) a roller coaster (= a track at a fairground that goes up and down very steep slopes and that people ride on in a small train for fun and excitement) （公路或铁路坡道上的）之字形路线；（公路或铁路的）不断起伏的路线